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Thread: Peak Eiger Ultra with 3.7v

  1. #1
    Flashaholic
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    Default Peak Eiger Ultra with 3.7v

    I'm new to Peak. I just have the Peak Eiger Ultra.
    Purchased new and used for first time today.

    The light flickers with Soshine 10440 3.7v 350mAh as I progress through the range-of-lumens.
    It burns bright and flawlessly when the head is screwed down to full-send.

    The light does not flicker with the regular battery supplied with the flashlight, and does not flicker with the AAA eneloop.

    Is the flickering with just Li-Ions common with Peak?

    Oddly enough, I think I prefer the non li-ion batteries in this light. I wasn't necessarily looking for a full-lumen-send in this light.
    That dim to moderate lumen range is really nice in this setup.

    It's still a super cool light. I won't be unhappy if the Li-Ions aren't consistent in that light...I'll just use the eneloop and know not to waste $ on various 10440s.
    Last edited by kerneldrop; 05-10-2021 at 09:06 PM.

  2. #2
    Enlightened mhs's Avatar
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    Default Re: Peak Eiger Ultra with 3.7v

    My new Logan QTC I got around 2 months ago had similar symptoms. It was ok with 1.2 V and 1.5 V cells, but with 3 V and 3.7 V it gave random strobe show almost like there was a loose electrical contact, even with the head tightened. After checking everything piece by piece I found the source of strobing was the new type of QTC donut; it's gray not black, more spongy and airy than solid rubber, easier to compress. Works better with single low voltage cells, but looks like new QTC's internal properties make it extremely unstable with higher voltage. In my case it makes 3 V configurations unusable. Peak's electronics support li-Ion cells, but this particular QTC spoils it. Maybe just bad QTC batch. I replaced QTC with old, black piece and now it's fine with 3.7 V. I hope they will work it out, because beside that it's great flashlight.
    I agree Peaks offer more than adequate output with low voltage cells, especially when you want to keep your vision night adapted. Nonetheless it's nice to have 3.7 V option for extra output demanding tasks.

  3. #3
    Flashaholic
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    Default Re: Peak Eiger Ultra with 3.7v

    I e-mailed Robyn to get her thoughts.

    I hope I can get the 3.7v working through the entire lumen range....it will make a fantastic light if i can get reliable output.

  4. #4
    Flashaholic
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    Default Re: Peak Eiger Ultra with 3.7v

    Quote Originally Posted by mhs View Post
    ...source of strobing was the new type of QTC donut; it's gray not black, more spongy and airy than solid rubber, easier to compress. Works better with single low voltage cells, but looks like new QTC's internal properties make it extremely unstable with higher voltage.

    Robyn is sending me a few differently sized pills and QTC material.
    Last edited by kerneldrop; 06-11-2021 at 12:13 PM.

  5. #5
    Flashaholic
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    Default Re: Peak Eiger Ultra with 3.7v

    Just an update: My Logan 17500 and Eiger Ultra work perfectly with li-ion batteries. From the most dim to the brightest there is no flickering

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